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The history of the Vaillant Group dates back to 1874, when Johann Vaillant set up a master fitter's business. In 1894 Johann Vaillant patented a new "closed-system" gas-fired bathroom boiler. [3] This was the first device that made it possible to heat water hygienically, without contaminating it with combustion gases.
Condensing boilers are water heaters typically used for heating systems that are fueled by gas or oil. When operated in the correct circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value) by condensing water vapour found in the exhaust gases in a heat exchanger to preheat the circulating water.
A boiler is a closed vessel in which fluid (generally water) is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, [1] [page needed] [2] [page needed] including water heating, central heating, boiler-based power generation, cooking, and sanitation.
Limescale build-up inside a pipe reduces both liquid flow and thermal conduction from the pipe, so will reduce thermal efficiency when used as a heat exchanger.. A descaling agent or chemical descaler is a liquid chemical substance used to remove limescale from metal surfaces in contact with hot water, such as in boilers, water heaters, and kettles.
1972-4: Vaillant takes over the College and Core City samples. 1983: Vaillant publishes The Natural History of Alcoholism: causes, patterns and paths to recovery. 1995: Vaillant publishes a new edition entitled The Natural History of Alcoholism Revisited, which includes the entire text of the 1983 edition plus new material marked "Revisited."
All of the Nazi extermination camps operated on the territory that is now Poland, although Nazi concentration camps were built in Germany and other countries.. The terms "Polish death camp" and "Polish concentration camp" have been controversial as applied to the concentration camps and extermination camps established by Nazi Germany in German-occupied Poland.
John Vaillant (born 1962) is an American Canadian writer and journalist whose work has appeared in The New Yorker, The Atlantic, National Geographic, and Outside. He has written both non-fiction and fiction books.
Michel Vaillant (also released as Need for Speed) [3] is a 2003 French film starring Sagamore Stévenin and Diane Kruger. It depicts events around the 24 hours of Le Mans race, based largely on a comic about the Michel Vaillant character.